Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753186AbXJVJmQ (ORCPT ); Mon, 22 Oct 2007 05:42:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751559AbXJVJmB (ORCPT ); Mon, 22 Oct 2007 05:42:01 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:59109 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751525AbXJVJmA (ORCPT ); Mon, 22 Oct 2007 05:42:00 -0400 Subject: Re: 100% iowait on one of cpus in current -git From: Peter Zijlstra To: Maxim Levitsky Cc: linux-kernel@vger.kernel.org In-Reply-To: <200710220822.52370.maximlevitsky@gmail.com> References: <200710220822.52370.maximlevitsky@gmail.com> Content-Type: text/plain Date: Mon, 22 Oct 2007 11:41:57 +0200 Message-Id: <1193046118.27435.166.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.10.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 941 Lines: 23 On Mon, 2007-10-22 at 08:22 +0200, Maxim Levitsky wrote: > Hi, > > I found a bug in current -git: > > On my system on of cpus stays 100% in iowait mode (I have core 2 duo) > Otherwise the system works OK, no disk activity and/or slowdown. > Suspecting that this is a swap-related problem I tried to turn swap of, but it doesn't affect anything. > It is probably some accounting bug. > > If I start with init=/bin/bash, then this disappears. > I tried then to start usual /etc/init.d scripts then, and first one to show this bug was gpm. > but then I rebooted the system to X without gpm, and I still see 100% iowait. > > No additional messages in dmesg. does sysrq-t show any D state tasks? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/